Gear-cutting machine.



I (ff/QM, @SGA/1@ Patented Nav. 7, 1916.

1. E. GLEAsoN, A. L. STEWART M, w. uLLocK.

GEAR CUTTING MACHINE. APPLICATION FILED JUNE 3. 1914.

"A anotnall J. E. GLEASON,` A. L. STEWART & E. W. BULLOCK.

GEAR CUTTING MACHINE. APPucmou mtu :uns e. |914.

Patented Nov. 7, 1916.

I3 SHEETS-SHEET 3.

I; E. GLEASON, A. L. STEWART &,E. W. BULLOCK.

GEAR CUTTING MACHINE. APPLICATION FILED IUNE 8. I9I4.

Patented Nov. 7, I9I6.-

I3 SHEETS-SHEET 4.

l. E. GLEASON, A. L1 STEWART 6L E. WQ BULLOCK.

GEAR CUTTING MACHINE.

APPLICATION men :uns 8.1914.

me l am@ e e SJ. e e 7 S e ou xl e m Q me l 5 me. m6 6 r... t w l| wMmmm. l O f y HL w ZUM" l. E. GLEASON, A. L. STEWART E. W. BULLOCK.

GEAR CUTTING M ACHINE. Arnlcmon msn :un: 8. m4.

1,203,608. Patented Nov. 7, 1916.

I3 SHEETS-SHEET. 6.

. @uuml u y Edf/farai WaZZ/)a l 1. E. GLEAsbN, A; L. STEWART al E. w.uLLocK.

GEAR CUTTING MACHINE.

APPLICATION FILEII JUNE 8. 1914.

1 ,203,608. Patented Nov. 7, 1916.

13 SHEETS-SHEET 7.

y v/r I I /l 90 1.36

123 e l as 1 3mm leao @www A APMM/wmf l. E. GLEASON, A. L. STEWART 6L E.W. BULLOCK.

` GEAR CUTTING MACHINE. '/PPLlc/nvlrx: ms :uns a, lsu.

Ptateted NY. 7, 1916.

I. lF.. GLEASON, A. L. STEWART 6L E. W. BULLOCK.

' .GEAR CUTTING MACHINE'.

APPucmou FILED :un: 8.1914.

1,203,608. f Y Patentedmw.7,1916.r

I BISHEETS-SHEET 9- 7.192.!! Y

l. E. GLEASON, A. L. STEWART 6L E. W. BULLOCK.

' GEAR CUTTING MACHINE.

APPLICATION rILEu JUNE 5,1914.

J. E. GLEASON, A. L. STEWART E. W. BULLOCK. GEAR CUTTING MACHINE.

.APPLICATION min :un: 8.1914.

1,208,608. PanwdNov. 7,1916.

I3 SHETS-SHEET l I.

l. E. GLEASON; A. L. STEWART L E. W. BULLOCK.

- GEAR CUTTING MACHINE. APPucmoN FILED JUNE 8. 1914.'

J. E. GLEASON, A. STEWART & E. W. BULLOCK.

GEAR CUTTING MACHINE. i ums/Trou man 1uNE a, lsu.

Patented Nov. 7, 1916.A

I3 SHEETS-SHEET I3.

i lhhlm Y @nvm/6M James/I (Medan/7 UNITED sTATEs PATENT oEEIoE.

JAMES E. GLEASON, ARTHUR L. STEWART, D EDWARDW. BULLOCK, 0F ROCHESTER,

NEW Y'ORK, ASSIGNORS T0 GLEASON PORATION OF NEW YORK.

WORKS, OF ROCHESTER, NEW YORK, A. COR

GEAR-CUTTING MACHTE.

Specification of Letters Patent.

To all whom 'it 12mg/ concern Be it known that we, JAMES E. GLEASON,ARTHUR L. STEWART, and EDWARD W. BUL- LoCK, all of Rochester, in thecounty of Monroe and State of New York, have in-4 vented certain new anduseful Improvements in Gear-Cutting Machines; and we do hereby declarethe following to be a full, clear, and exact description of the same,reference being had to the accompanying drawings, forming a part of thisspecification, and t0 thel reference-numerals marked thereon.

Our invention relates to gear cutting machinery, with particularreference to that type of apparatus which is employed for cutting curvedor so-called spiral teeth and for producing teeth of this character onbevel gears, and it has for its particular object to provide an improvedconstruction and arrangement of parts, affording a structure which is inthe nature of an improvement upon and possesses marked advantages overthe apparatus shown and-described in the pending application of James E.Gleason, Serial No. 769,808, filed May 26, 1913.

A further purpose of the invention is to afford a practical and'eiiicient machine that Will automatically generate a curved bevel geartooth, or what is commonly-known as a spiral bevel gear tooth, althoughthe present machine does not contemplate cutting on a curve defined by atrue spiral, since a tooth of any curvature is believed to possess theinherent advantages in a gear constructed according to our invention,and it is our present purpose to construct a machine that can besuccessfully applied in generating different sizes of gears havingcurved teeth, with such speed and accuracy as to make it practicable fora gear of this type to be used on a large scale commercially.

To these and other ends the invention consists in certain improvementsand combinations of parts, all as will be hereinafter more fullydescribed, thev novel features being pointed out in the claims at theend of the specification.

In the drawings: Figure 1 is a plan View with the parts in section. Fig.2 is a vertical 'central sectional view showing parts in side elevation,the blank carrier being withdrawn from cutting position. Fig. 3 is aside elevation ofthe machine with the 'parts in the same position as inFig. 2. Fig. 4 is an end in Fig. 21.

v iew of the machine showing parts in section. Fig. 5 is an elevation ofthe opposite end of the machine, ,partially in section. Fig. 6 is acentral transverse sectional view on the line 6 6 of Fig. 2. Fig. 7 V'isan end elevation, showing the index mechanism. Fig. 8 is a detailed'endelevation of the index mechanism; Fig. 9 is a plan view ofthe reversingmechanism. Fig. 10 is a side elevation of the same. Fig. .11 is ayvertical sectional view of the reversing mechanism. Fig. 12 is avertical sectional view on the line 12a- 12aL of Fig. 11. Fig. 13 is adiagrammatic view showing the development of the cam illustrated in Fig.12. Fig. 14 is a vertical sectional view on the line 14a-14a of Fig. 12.Fig. 15 is a detail view in elevation, with a portion in section on theline 153--15a of Fig. 1l. Fig. 16 is a transverse sectional view throughthe driven member of the reversing mechanism' on -the line 16a-16a ofFig. 11. Fig. 17 is a similar view showing the parts in anotherposition. Fig. 18 is a horizontal sectional view taken longitudinallythrough the reversing slide on the line lfia--la of Fig. 10. Fig. 19 isan elevation of the reversing slide bracket with the cap removed. F ig.20 is a vertical soctional view of the cutter support on the line 20H-2WL of Fig. 2. Fig. 21 is an enlai` l' sectional view on the line211--21a of Fig. 7. Fig. 22 is a y vertical sectional view takenlongitudinally of the parts shown Fig. 23 is an enlarged plan view ofthe cam llshown in Fig. 12, and the coperating parts. Fig. 2l is asectional view of the parts connectingl saidy cam with the frame onthe'line 21a-#21a of Fig 23. Fig. 25 is a plan view of the parts shownin Fig. 24, with the upper portion omitted. Fig. 26 is a plan view of apart of the frame on which the blank carrier is mounted. Fig.-27 is adetail view of a portion of the controlling mechanism for the .indexingmechanism, and Fig. 28 is a sec tional view on the lineI QSl-QSa of Fig.1.

Similar reference characters throughout the several views indicate thesame parts.

In order to afford a general umlerstanding of the nature and operationof our ma chine, we will state that there is preferably employed arotating annular cutter which is Patented Nov. 7, 1916.

mounted on an oscillatory support in the nature of acradle that isadapted l.to be moved BEST AVAlLABLEv CCP mation of the cutter resultingin cuttingr through an arcuate path. After each complete operation,resultingin the completion of one side of a tooth, the frame on whichthe blank carrier is mounted is automatically moved to withdraw the'work from operative engagement with the cutter and while the blank is inthis retracted position, the indexing mechanismv is brought intooperation and automatically moves the blank the space of one tooth so asto present an uncut portion to the cutter when the .trame is returned toits initial position. The cutter support or cradle is operated first inone direction and thence backwardly to its first position by a suitablereversing mechanism that is connected also with the blank whereby the.latter is rolled or rotated on its longitudinal axis coincident with theoscillatory-n'iovexnent of the cutter support, thc movement of the partsas thus generally described being preferably obtained by suitably timedgearing. v

In the 'present arrangement, which illustrates a preferred embodiment ofthe structure, although the invention is not to be limited to theprecise combination set forth and described, 1 designates the base ofthe machine, on which is mounted the (lished bed :2 for the cuttersupport, said cutter support being preferably in the form of a cradle 3which is provided on its lower face with tracks 4 adapted to travel incorresponding guideways on the bed 2. Ad j ustably mounted on the cradle3 is a base plate 5 which is adjustable laterally by means of a screw (iand carries vertically' arranged tracks 7 which support a casting 8 uponwhich the cutter and drive mechanism therefor is arranged, said castingbeing adjustable on the guides 7 by means of a threaded post 9. rl`hecutter is preferably of annular formation, consisting of a series ofcutting blades, designated at 10, arranged about -a disk and extendingin a direction parallel with the axial line of the shaft 11 on which thecut-.

ter is mount-ed. The sha-'ft 11. is mounted in suitable bearings andcarries aA bevel gear 1:2 which is driven from the main drive shaft 1.3in the following manner: The. drive shaft 13 carries the pulley 14 whichmay he operated from any desirable source of power and also a bevelpinion 15 meshing with the corresponding pinion 1G on the shaft 1T. rlhelatter carries at its opposite end a correspending pinion engaging thegear 18, keyed on the. shaft 19, which through the bevel gear 2Uoperates a vertical shaft 2l upon which 1s splmed a bevel gear" 23 is astub shatt mounted 1n bearings in the casting 8, having at one endafbevcl gear 24 engaging the gear 22, and atitsopposite end a bevelpinion meshing with the gear 2G upon the shaft 2T. 28 is a spur gearmounted on the opposite end of the shaft 2T and, meshing with acorresponding gear Q9 on the shaft 30. fll is a shat't mounted parallelwith the shafts-27 and 30 andcarrying a bevel pinion which engages thebevel gear 12 on the cutter spindle ll.' u' 'l`hc`shaft 31 also carriesa gear ifmeshing with the spur gear :il on the shaft 30.` lt will beseen that through the gearing thus described, motion, is constantlytransmitted from the main drive to the. rotating cutter, and by the uruil rangement of gearing and bearings, the posi*- tion of the cutter mayhe altered, both as to vertical and horizontal adjustment to accommodatework of` dili'erent character.

In order to adjust the cutter in u direction toward and from the work,we muy cmplo)- the construction shown in l-`igs. 1 and 28, in which thespindle-11 is adjustable longitudinally of its avis. To this end thereis arranged on the spindle a sleeve 35 which is threaded exteriorlyy fora portion of its length and engagedby an adjusting rin,"r 3G, thatalsohas threaded engagement with the sleeve Sand is formed on itsexterior with a series of worm tcetlrwith which coperates a worm 3i'secured on the adjusting spindle It will `be sven that by turning theadjusting spindle 3S, rotation' ol the adjusting ring 3G is ell'ectedand this vcauses a corresponding longitudinal movement of the sleeve 35and with it the cutter spindle l1.

The' cradle or cutter support itis oscllated about an axis other thanthe rotary axis of the cutter spindle 1l on the. guidewziys of the base2 and 'to this end it carries a toothed segmental rack 3f). .lournalmlin suitable bearings in the base is a shaft 40 carrying a worm 41 whichengages` thetoothcd ruckv39 and is rotated alternately in ,oppositedirections so as to ei'cct the necessary oscillation ot the cradle. 4Theshaft '40 is driven from the shaft 42 by means `of cooperating bev'-eled pinions 43 and 44 mounted respectively on theshat'ts 40and 42, saidshaft 42 carrying at its opposite ondakr gear l5 which is drivenA inajmanner .that will now be described. v i rThe main drive shaft 13 isprovided at one end with 'a gear 4G which operates through the changegears 47 and 48 to drive the gear 49 on the shaft 50 whiiflris shownenlarged in Fig. 11 and constitutesfthe driving member ot' the reversingmechanism. The driven member, which is alternately rotated in oppositedirections, and ,transmitsits motionr to the various partsof theapparatus, is indiioo vcated at 51 and comprises a shaft upon `which iskeyed a disk 52. The latter is prol' the clutch( 53 and 54 respectively,and are constantly driven in opposite directions from the driving shaft50. Each of the sleeves 55 and 56 is provided With a gear Wheel, thegear on sleeve 55 being driven through the intermediate gear 57 meshingwith the gear 58 on the shaft 50, While the sleeve 56 is operateddirectly from the gear 59. The shaft 50 also carries a pinion 60 inengagement With an intermediate gear 61 which meshes Witha gear 62carried upon a "shaft 63, the latter being provided with a worm'64. Inthis manner, the worm v64 is constantly rotated in` one direction andtransmits its motion to the shaft 65 through a Worm Wheel 66. Theoperation of the clutches 53 and 54 isl controlled from the shaft 65 ina manner which We will now explain.

The dogs or clutches 53 and 54 are fixedly mounted upon the oscillatorypin 67 which is suitably journaled iii the disk 52, and the dog 53 isprovided with a notched tail piece 68 with which coperates a springactuated pin or plunger 69 so as to hold the dogs norymally in theposition shown in Fig. 17. The

sleeves 55 and 56 are each provided With a shoulder or projection 70arranged to be nated at 71 and 'engaged alternately by the dogs 53 and54. With the parts in the position shown in Fig. 17, the disk 52 isbeing carried around by `dog 54, and when the pin 67 is rocked it bringsthe other dog 53- into engagement With the corresponding shoulder 70,causing the disk to be rotated in the samedirection as the correspondingsleeve. To reverse the operation of thedisk, it is necessary to rock thepin 67 in the opposite direction disengaging the one clutch and bringingthe other clutch into engagement with the shoulder on the oppositelyrotating sleeve. This movement of the clutches is secured automaticallythroughl a reversing slide desigprovided with a pair'of anti-frictionrollers 72, forming abutments which are projected into the path of thetail pieces of the dogs, one of the rollers 72 cooperating With ne dogWhile the other cooperates With the other dog. Thus by reciprocating theslide 7l, the clutches are alternately engaged with the constantly looserotating sleeves on-the driven member, and through these, the drivenmember is rotated in opposite directions at regular and prede terminedintervals. The slide 71 is operated from a crank arm 73 carried on theshaft 74 and connected by link 75 With a v11, rocking the shaft 74 inone :by the central shaft 94.

post 76 on said slide. The shaft 74 also carries an arm 77 which isprovided with a shoulder 78 and an -end portion 79 by which the shaft isoperated in opposite directions. This movement is obtained from theshaft 65 by means ofa segmental arm 80 rcarried on said shaft andprovided with a pair of cams or extensions 81 and 82. As the shaft 65 isrotated, the cam 82 comes into engagement with the shoulder 78, as shownin Fig. direction, after which it returns to its initial position.Subsequently, the cam 8l engages the end portion 79 of the arm 77,moving the latter upwardly and rocking the shaft 74 in the oppositedirection. This causes the automatic reversal of the movement of thedriven member 51, the timing of such reversal being determined by theposition of the cams 81 and 82. The reversing slide is returned eachoperation of cams 81 and 82, by means of aA spring 83 `which isconnected at one end to a stationary post 84 and` at its opposite end toa lever 85 pivotally mounted at 86 upon the casing or box within whichthe slide 7l is housed. The lever 85 embodies oppositely extending armseach of which eooperates with a pin or projection 87upon the slide, thecasing being slotted at 88 to permit longitudinal movement of the pins`87 as the slide is operated first in one direction and then in theother, While the spring 83 serves to return the slide to its normalposition.

The blank carrier is designated at 89 and comprises an arbor havingfixed thereon at 'its outer end a Worm Wheel 90, and arranged Within asleeve 91 Which is mounted in suit-k able bearings on the bracket 92.The bracket 92 is adjustably arranged upona turret or frame 93 Which ispivotally mounted to swing about a vertical axis determined The frame orturret 93 is oscillated at predetermined intervals to move the blank outof engagement with the cutter to permit the indexing operation, andthereafter to return it to position for cutting.l In order to elect sucha movement of the frame automatically, Weprovide a cam 95 fixed upon theaforementioned shaft 65 and coperating With the projection 96 attachedto the plate 97. The plate 97 is adjustably secured to the frame and tothis end carries an adjustable block 98 arranged in a guideway 99 andprovided with a stud y100 which engages a corresponding opening in theblock 101, the latter being slidably disposed in a guideway 102 of thecarrier 103,' which latter is attached to and forms a part of thepivoted turret or frame.

\The cam slot of the cam 95 is of such a` BEST AvAiLABLE coeV completionof one, cutting operation [and withdraws the blank for a period longenough to permit the latter to be indexed while it is disengaged fromthe cutter.

The rolling or generating movement of the work, which .occurs during thecutting operation in order to eitect the proper gcneration or shaping ofthe sides of the tooth is obtained through a toothed segment 101 whichis secured upon the plate 105 carried bv the sleeve 91, it beingunderstood that under normal conditions, the sleeve 91 is locked forrotation with the arbor 89 and thus any movement of the toothed segmentreferred to is transmitted to theblank during the cutting operation. The.segment 10i is engaged by the worm lOla mounted on a shaft whichCarries a bevel pinion 10G in engagement with a corresponding pinion 10ikeyed to the shaft 10S. The latter is driven through suitable changegears designated generally at 10S, from the shaft 109 mounted inbearings on the frame. said shaft 109 being in turn driven from the'shaft 110. The shaft 110 is rotated through a bevel gear 111 which isfixed upon the vertical sleeve 112, carrying at its lower end a gear 113engaged by the bevel pinion 114. 115 designates a lspindle carrying saidpinion 111 and at its opposite end provided with a pinion 11G that. isoperated from the gear 117 mounted upon the shaft l2 which is drivenalternately in opposite directions by thc reversing mechanism through agear 118 keyed upon the driven shai'tl and cooperating with the gear 45on the shaft 42. In this manner the reversing mechanism operates throughthe shaft 'l2 to impart and generate au opposite, rotary movement to theblank carrier and atthe same time to oscillate orrock the cutter supportwhile the cutter is in operative engagement with the blank and rotatesabout an axis other than the axis of oscillation of thc cutter support.

lVe will now describe the mechanism by which the blank is indexedbetween cutting operations through an automatic operation.

'lhe index mechanism is driven from the shaft 19 through the verticallydisposed shaft 91 which is geared to the spindle 119, the latter in turndriving the vertical spindle 120. The gcar121 mounted on thc shafttransmits movement to the stud shaft 122 which carries the worm 123 inengagement with the -worm wheel 121 which is loosely mounted upon ashaft 125. The latter carries a gear 126 meshing with the int termediategear 127 which in turn engages a gear 12S, mounted upon shaft 129. Saidshaft 129 carries a worm' 130 in engagement with the worm wheel 90. Theworm Wheel 12J. is constantly rotated while the'shaft 125 is normallystationary7 and through the worm 130 serves to hold the blank againstany relative movement within the sleeve 91 except when the partsarereleased to index the work in. the manner which we will n ow describe.To this end,` theshaft carries a disk 131 fixed thereon `anda looselyarranged disk 132. The shaft is also provided with a gear 133 whichkdrives a stub shaft 131 arranged parallel tothe main shaft 125.

and operated through y suitable gears as shown in Fig. 22 to drive theloosely moimted disk 132. theparts beingso 'geared' that the loose disk132 makes one revolution while the fixed disk 131 is makingtwo. The disk132 is provided with alat surfacel at its edge for a purpose thatwillappear presentlyand-a1so`carries a stop or projection arranged to beengaged if by a pivoted spring actuated abutment 13T. The worm wheel124: has attached theretoa ratchet wheel 13S and pivotally mounted onthe disk 131 isa spring actuated clutch yor dog 139v engagement with theratchet wheel bythe spring 141, causing the disk^131 to" be ro? tatedwith the worm wheel 121. The shaft 125 is thus given twocomplete"reviolutions, that is until the tlat portion of thef'disk 132is returned to its. initialposition,.permitting the arm 14+ to withdrawthe dog from engagement with the ratchet wheel and at the same time`prevent reverse movement of the shaft 125 by engagement` of theabutment 13T with lthe projection 130. Movement of' thearm 114is'etfected autoin`ati rally, at predetermined periods,"and for thispurpose. the arm hasconnected thereto a link 146 which is pivoted` tothe lever 147., the latter being pivoted at 148and carrying ananti-friction device 149. 150 designates a. shoe arranged to engagetheantisfriction device 119 to eiieet theoperation oftheindexingmeclmni'sm,y said; shoefbeing actuated b vthe arm 151 seciiredto a``I1ocltsliaft"`152 vwhich is further/provided with fa toothed segment'1' lvdesigliates a second rockshaft carrying va toothedfsegment lfinengagement with the aforementioned segment 153, and provided at `its.lopposltetend'with 'lai 10d mit. i ffff 95 y msm to bedescr1bed,'tliedog 1s moved into t' carries at its other end a tooth orprojectionYV` 162 arranged for engagement by a camsl which is mountedupon an arm lffzarried by the worm wheel 66 as shown in Figs. 11, 12 and14. By this means, at each revolution of the shaft 65, the rockfshaft161 is tripped and through it the index mechanism is released causingthe blank to be operated through the space of one tooth, after which theblank carrying frame is automatically returned to cutting position, byvthe mechanism that has been previously described, and another cuttingoperation .takes place.

The operation of the machinemay be described briey as follows: Ablank ispositioned on the blank carrier, and the latter is then adjusted aboutthe vertical center of the machine until the cutter 10 is atthe desireddepth with reference to the teeth to be finished, as shown in Fig. 1. Itwill be understood that the apparatus is primarily designed forfinishing ther side faces of teeth, or in other words, generating thesides of the teeth after they have been preliminarily roughed out on a`roughing machine. The blank and cutter having been adjusted to theposition shown in Fig. 1, the machine is set in operation and the cutterhead is r0- tated through one tooth spaceat a time. During such rotationof the cutter, a relative generating movement of the cutter and blank isobtained by rotating the blank slowly about its own axis, and at thesame time rolling the cutter, or iny other words, oscillating the cradleor cutter support 3 on the tracks vof thebase. Vhen the cradle 3 hascompleted its movement in one direction from one extreme position to theother, the 'cutter will have completed one face of a tooth, and theblank support is then automatically swung about the vertical center ofthe machine to withdraw the blank from the cutter, whereupon the cuttersupport or cradle is moved back to its initial position, ready for asecond operation. ter support or cradle is bein returned to its initialposition, the blan i' is indexed,

` while the latter is withdrawn from the cutter, and the blank supportis then operated to return the blank into cutting .relation with thecutter with the next adjacent. tooth face ready to be iinished,'and theoperation is repeated. One side of each tooth is finished entirelyaround the blank in the inanner already described, and the blank visthen readjustcd with reference to the cutter, and

a similar operation takes place for linishing the opposite sides of theltooth.

We claim as our invention:

1. In a gear cutting machine, the combination with a dished bed, of a.support movable on said bed, means for oscillating the support, acutter mounted on the support and embodying a substantially annularcutting portion which is movable through;

As the cut- Ythe blank lengthwise of the tooth, means for rotating thecutter, Y a vpivotally mounted frame, a blank carrier arrangedon theframe, gearing for rotating the blank car; rier, and means foroscillating the frame about its axis.

2. In a gear cutting machine, the com-v bination with 'a dished bed, ofa support movable on said bed, means for oscillating` ,the blank carrieralternately in opposite d1- rections, and means for oscillating theframe about its axis.

3. In a gear cutting machine, the combination with a dished bed, of asupport movable on said bed, means for oscillating the support, a cuttermounted on the sup-4 port and einbodyln a cutting portion which .ismovable throug the blank in a curvilinear path lengthwise of the tooth,means for operating the cutter, a pivotally `mounted frame, a blankcarrier arranged on the frame, gearing for rotating the blank carrieralternately in opposite directionsl and means for oscillating the frameabout its axis.

4. In a gear cutting machine, the coinbination with a dished bed, offasupport movable on said bed, means for oscillatingthe support, a cuttermounted in the support and embodying a cutting portion which s c linearpath lengthwise of the tooth, means`r is movable through the blank in acurvi for operating the cutter, a pivotally mounted frame, a blankcarrier arranged` on the frame and adjustable thereon for changing theposition of the blank carrier relatively to the cutter, gearing forrotating the blank carrier alternately in opposite directions, and meansfor `oscillating the frame about its axis. c

5. In a gear cutting machine, the combination with a dished bed, of asupport" movable on the bed, a cutter mounted on the support, means foractuating the support, means for operating the cutter, apiv otallymounted irame, a blank carrier arranged on the frame, means for rotatingthe blank carrier to genera-te the profile of 4a tooth, and means foroscillating the frame.

6. In av ear cutting machine, the cornbination with a dished bed, of asupport movable on the bed, a cutter mounted on the support, means foractuating-the 'support,v means for operating the cutter, a piv- -otallymounted frame, a blank'carrier arranged on the frame and angularly''adjust- .iso

and movable in a curvilinear path length-v wise of the tooth.

8. In a gear cutting machine, the combination with a frame pivotallymounted to oseillate about a vertical axis, voit' a blank carriermounted on said frame, a cutter support which is oscillatory about alhorizontal axis, and a cutter mounted in said support and movable in acircularl path lengthwise of the tooth.

9. In a ear cutting machine, the combination with a frame pivotallymounted to oscillate about a vertical axis, of a blank carrier mountedon said frame, a cutter support which is oscillatory about a horizontalaxis, and a rotary cutter mounted on said support and movable in acircular path lengthwise of the tooth,

10. In a gear cutting machine, the combination with a blank carrier, ofa cutter support which is oscillatory about ahorizontal axis to generatethe side of a tooth, and a cutter mounted thereon and movable about anaxis other than the axis of oscillation in a curvilinear path lengthwiseof the tooth.

11. In a gear cutting machine, the combination with a blank carrier, ofa. cutter sup portl which is oscillatory about a'horizontal axis togenerate the side of a tooth, and a. cutter mounted thereon and movableabout an axis other4 than the axis of oscillation in an arcuate pathlengthwise of the tooth.

12. In a gear cutting machine, ythe combination with a blank carrier, ofa cutter support which is oscillatory about, a horizontal axis togenerate the side of a tooth, and a rotary cutter mounted on saidsupport and movable about an axis other than the axis of oscillation ina circular path lengthwise of the tooth.

`13. In a gear cutting machine, the combination with a blank carrier,`of a cutter'support which is oscillatory about a horizontal axis, meansactiiig to impart an oscillatory movement to said cutter support andsimultaneously rotate the blank carrier alternately in oppositedirections to generate the profile of the tooth, and a cutter mounted onsaid support and movable in a curvilinear path lengthwise ofthe tooth.

14. In a gear cutting machine, the combination with a blank carrier, ofa cutter supv port which is oscillatory about a horizontal axis, meansacting to impartan oscillatory movement to said cutter supportandsimultaneously rotate the blankkcarrier alternately in oppositedirectionsto generate the profile of the tooth, and aV cutter mounted onsaid support and movable in an arcuate path lengthwise of the tooth.

15. In a gear cutting machine, the combination with a blank carrier,offacutter support which is oscillatory aboutar horizontal axis, meansacting to impart` an oscillator movement to said cutter supportand s1-Vmultaneously rotate the blank carrier alternately in opposite directionsto generate the profile of the tooth, and ak rotary cutter mounted onsaid support and movable ina ,circular path lengthwise ofthe tooth.

16. In a gear cutting machine, the combination with a frame pivotally`mounted to oscillate about a vertical axis, of a'blank carrier mountedon said frame, a cutter support which is oscillatory about/*a horizontalaxis, means acting to impartan oscillatory movement to saidcuttersupport and simultaneously rotate the blank carrier altern'atelyin opposite directionsfmeans for4 oscillating said frame, and a clittermounted on the support and movablelinla curvilinear path lengthwise ofthe toothilt` y 17. In a gear cutting machine, the combination with aframe pivotally mounted to oscillate about a vertical axis, of,y a blankcarrier mounted on said 1'rame,[a cutter support which is oscillatoryaboutak horizontal axis, means acting to impartan oscillatory` movementto said cutter supporty and s1,-

multaenously rotate the blank carrier alterL nately in oppositedirections',`rmeans for oscillating said frame, and a cutter mounted inthe support movable in .anarcuate path lengthwise of the tooth. y

1S. In a gear cutting machine the combination with av frameapivotallymounted to oscilla'te about a vertical.. axis, of a blank carriermounted on said frame, a cutter support which is oscillatory about ahorizontal axis means actin Jr to im artA an oscillator bination with apivotally mounted frame and an oscillatory support, oiga blank carriormounted on the frame,` and a cutter 35 ter about an axis other thanandvparallel to mounted on the support, and reversing mechanismoperatively connected to the blank carrier and to the support.

In a gear cutting machine the combinationwitha pivotallymounted frameand an oscillatory support, of a blank carrier mounted on the frame,reversing inechanism operatively connected to the blank carrier and tothe support, and a cutter ll mounted on the support ano`l adaptedtotravel in a curvilinear path lengthwise of the tooth. Y

22. In a gear cutting machine the combination with a pivotally mountedframe and an oscillatory support, of a blank car,- ri'er mounted on theframe, reversing mechanism operatively connected to the blank carrierand tothe support, and a cutter mounted on the support embodying acuttingv portion movable in an arcuate path lengthwise of the tooth. s

23. In a gear cutting machine the coinbination with a pivotallyinountedframe and an oscillatory support, of a blank carrier mounted on 'theframe, reversing mecli- .anisin operatively connected to the blankcarrier and to the support and a rotary cutterl mounted on the support,and movable in a circular path lengthwise of the tooth.

24. Ina gear cutting machine, the coinbination With a blank carrier, ofa rotary cutter,l means for operating the cutter in a curved path acrossthe 'face of the blank,

-means for rolling the blank carrier, and

means for simultaneously oscillating the cuti its rotative axis.,

25. In a gear cutting machine, the combination with av blank carrier, ofa rotary cutter, means for rolling' the blank relatively to the cutterto generate the tooth,

. means for oscillating the cutter about an axis other than its rotativeaxis, and means for positively holdingthe blank against ro- 'circularpath across the face of the blank,

through the arc of a circle across the face of the blank', and means forsimultaneously oscillating the cutter about an axis other than itsrotative axis.

28. In a gear' cutting machine, the combination with aj-blank carrier,of a rotary cutter, means for operating the cutter across the face ofthe blank in a curved path, and means for simultaneously oscillating thecutter about an axis other than its rotative axis.

29. The method of cutting gears which consists in moving a tool in acurved path to shape the tooth and simultaneously rolling the toolrelatively to the blank in a path out of parallelism with the cuttingpath to generate the'tooth.

30. The method of cutting .gears which consists in causing the cutter totravel in a and simultaneously rolling'the cutter about an axis otherthan its rotative axis.

JAMES E. GLEAsoN. ARTHUR L. `srnvviinr. EDWARDl vv. BULLocK.

Witnesses;

EARLE V. PA'i'rERsoN, S. H. EARL.

cutter to generate the tooth, means forv operating the cutter in acurved path

